* {
  margin: 0;
  padding: 0;
  font-family: 微软雅黑, serif;
}

input {
  border: none;
  outline: none;
}

.center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.align_center {
  display: flex;
  align-items: center;
}

.ju-center {
  display: flex;
  justify-content: center;
}

.row {
  display: flex;
  flex-direction: row;
}

.column {
  display: flex;
  flex-direction: column;
}